Method test_move

Lib/test/test_mmap.py:363–408

(self)

                              offset=2147418112)

    def test_move(self):
        # make move works everywhere (64-bit format problem earlier)
        with open(TESTFN, 'wb+') as f:

            f.write(b"ABCDEabcde") # Arbitrary character
            f.flush()

            mf = mmap.mmap(f.fileno(), 10)
            mf.move(5, 0, 5)
            self.assertEqual(mf[:], b"ABCDEABCDE", "Map move should have duplicated front 5")
            mf.close()

        # more excessive test
        data = b"0123456789"
        for dest in range(len(data)):
            for src in range(len(data)):
                for count in range(len(data) - max(dest, src)):
                    expected = data[:dest] + data[src:src+count] + data[dest+count:]
                    m = mmap.mmap(-1, len(data))
                    m[:] = data
                    m.move(dest, src, count)
                    self.assertEqual(m[:], expected)
                    m.close()

        # segfault test (Issue 5387)
        m = mmap.mmap(-1, 100)
        offsets = [-100, -1, 0, 1, 100]
        for source, dest, size in itertools.product(offsets, offsets, offsets):
            try:
                m.move(source, dest, size)
            except ValueError:
                pass

        offsets = [(-1, -1, -1), (-1, -1, 0), (-1, 0, -1), (0, -1, -1),
                   (-1, 0, 0), (0, -1, 0), (0, 0, -1)]
        for source, dest, size in offsets:
            self.assertRaises(ValueError, m.move, source, dest, size)

        m.close()

        m = mmap.mmap(-1, 1) # single byte
        self.assertRaises(ValueError, m.move, 0, 0, 2)
        self.assertRaises(ValueError, m.move, 1, 0, 1)
        self.assertRaises(ValueError, m.move, 0, 1, 1)
        m.move(0, 0, 1)
        m.move(0, 0, 0)


    def test_anonymous(self):